diff --git a/src/util/Flag.py b/src/util/Flag.py
new file mode 100644
index 00000000..37cfdfba
--- /dev/null
+++ b/src/util/Flag.py
@@ -0,0 +1,22 @@
+from collections import defaultdict
+
+
+class Flag(object):
+    def __init__(self):
+        self.valid_flags = set([
+            "admin",  # Only allowed to run sites with ADMIN permission
+            "async_run",  # Action will be ran async with gevent.spawn
+            "no_multiuser"  # Action disabled if Multiuser plugin running in open proxy mode
+        ])
+        self.db = defaultdict(set)
+
+    def __getattr__(self, key):
+        def func(f):
+            if key not in self.valid_flags:
+                raise Exception("Invalid flag: %s (valid: %s)" % (key, self.valid_flags))
+            self.db[f.__name__].add(key)
+            return f
+        return func
+
+
+flag = Flag()